Cuarenta Años Después De “La Distribución Del Guanaco (Mammalia, Camelidae) en La Provincia De Buenos Aires Durante El Pleistoceno Tardío Y Holoceno. Los Factores Climáticos Como Causa De Su Retracción”

Assessing the diet of modern and archaeological guanacos from the Great Chaco in Córdoba, Argentina, through stable isotope analysis (δ13C, δ15N) of bone and dentin collagen: Implications for paleoenvironmental and zooarchaeological studies

“…Indeed, following Tonni and Politis (1980) model, guanacos' retraction in the eastern Pampas started at the end of the Late Holocene, probably as a result of climatic changes related to the Medieval Climatic Anomaly (Politis and Pedrotta, 2006). The retraction would have followed an east-west direction, leading to their disappearance from the Pampean region by the XVI century (Politis, 2023;Politis et al, 2011). As mentioned, this suggests that the timing of the retraction of guanacos in Córdoba is probably later and may thus not be represented in our archaeological data.…”

“…This last point is of particular importance in addressing the timing and possible causes of guanaco retraction in this part of the Gran Chaco. The retraction of this species has been a long-discussed topic in Central Argentina, especially in the Pampean region, where it has been attributed to a shift in climatic conditions at the end of the Late Holocene (Politis, 2023;Politis et al, 2011;Politis and Pedrotta, 2006;Tonni and Politis, 1980). To the west of the Pampas, one of the current hypotheses on this matter -built upon the application of evolutionary foraging models in zooarchaeological analysis-proposes that the encounter rate of guanacos decreased across the Holocene, starting in the Middle Holocene, as a result of human-induced prey depression Medina and Rivero, 2020;Rivero and Medina, 2016).…”

Zooarchaeological perspectives in the framework of the Anthropocene: Contributions to ecological, environmental and conservation studies from South America

“…Weihmüller et al (this volume) also address the temporal and spatial variation in the isotopic ecology of guanacos in Central Argentina in order to discuss the timing and potential causes of guanaco retraction in the area. This has been a long-discussed topic in the region, usually attributed to environmental change during the late-Holocene or to human-induced pressure during the middle Holocene (Medina and Rivero, 2020;Politis, 2023). The results discussed by Weihmüller et al (this volume) point to a more recent retraction, at least in Central Argentina, probably linked to recent environmental perturbations like biological invasions (Ballari et al, 2016).…”